const path = require('path')
const webpack = require('webpack')
const CompressionWebpackPlugin = require('compression-webpack-plugin')

function resolve(dir) {
  return path.join(__dirname, dir)
}

const isProd = process.env.NODE_ENV === 'production'

const assetsCDN = {
  // webpack build externals
  externals: {
    vue: 'Vue',
    'vue-router': 'VueRouter',
    vuex: 'Vuex',
    axios: 'axios'
  },
  css: [],
  // https://unpkg.com/browse/vue@2.6.10/
  js: [
    '//cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.min.js',
    '//cdn.jsdelivr.net/npm/vue-router@3.1.3/dist/vue-router.min.js',
    '//cdn.jsdelivr.net/npm/vuex@3.1.1/dist/vuex.min.js',
    '//cdn.jsdelivr.net/npm/axios@0.19.0/dist/axios.min.js'
  ]
}

// vue.config.js
const vueConfig = {
  configureWebpack: {
    // webpack plugins
    plugins: [
      // Ignore all locale files of moment.js
      new webpack.IgnorePlugin(/^\.\/locale$/, /moment$/)
    ],
    // if prod, add externals
    externals: isProd ? assetsCDN.externals : {}
  },

  chainWebpack: (config) => {
    config.resolve.alias.set('@', resolve('src'))
    const svgRule = config.module.rule('svg')
    svgRule.uses.clear()
    svgRule
      .oneOf('inline')
      .resourceQuery(/inline/)
      .use('vue-svg-icon-loader')
      .loader('vue-svg-icon-loader')
      .end()
      .end()
      .oneOf('external')
      .use('file-loader')
      .loader('file-loader')
      .options({
        name: 'assets/[name].[hash:8].[ext]'
      })

    // if prod is on
    // assets require on cdn
    if (isProd) {
      config.plugin('html').tap(args => {
        args[0].cdn = assetsCDN
        return args
      })
    }
  },

  css: {
    loaderOptions: {
      less: {
        modifyVars: {
          // less vars，customize ant design theme
          // 'primary-color': '#F5222D',
          // 'link-color': '#F5222D',
          'border-radius-base': '2px'
        },
        // DO NOT REMOVE THIS LINE
        javascriptEnabled: true
      }
    }
  },
  pluginOptions: {
    'style-resources-loader': {
      preProcessor: 'less',
      patterns: [
        resolve('src/style/mixin.less')// 引入全局less mixin与 less 变量
      ]
    }
  },
  devServer: {
    port: 9527,
    open: true,
    overlay: {
      warnings: false,
      errors: true
    },
    proxy: {
      // change xxx-api/login => mock/login
      // detail: https://cli.vuejs.org/config/#devserver-proxy
      [process.env.VUE_APP_BASE_API]: {
        target: `/`, // mock转回给本项目
        // target: `http://localhost:8080/xqc-seagull-server/`,
        changeOrigin: true,
        // 改写..
        pathRewrite: {
          ['^' + process.env.VUE_APP_BASE_API]: ''
        },
        onError: (_err, req, res) => {
          res.status(200).send({ httpCode: 500001, msg: '服务器异常，请尝试刷新。刷新多次无效，请联系管理员。' })
        }
      }
    }
  },
  // disable source map in production
  lintOnSave: process.env.NODE_ENV === 'development',
  productionSourceMap: false,
  // babel-loader no-ignore node_modules/*
  transpileDependencies: []
}
// 添加gzip压缩
if (isProd) {
  const productionGzipExtensions = /\.(js|css|json|txt|html|ico|svg)(\?.*)?$/i
  vueConfig.configureWebpack.plugins.push(
    new CompressionWebpackPlugin({
      filename: '[path][base].gz',
      algorithm: 'gzip',
      test: productionGzipExtensions,
      threshold: 10240,
      minRatio: 0.8
    })
  )
}

module.exports = vueConfig
